<template>
    <div class="login_container">
        <div class="login_box">
            <!-- 头像区域 -->
            <dir class="avatar_box">
                <img src="../assets/logo.png">
            </dir>
            <!-- 登陆表单区域 -->
            <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" class="login_form">
                <!-- 用户名 -->
                <el-form-item prop="username">
                    <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
                </el-form-item>
                <!-- 密码 -->
                <el-form-item prop="password">
                    <el-input v-model="loginForm.password" prefix-icon="iconfont icon-password" type="password"></el-input>
                </el-form-item>
                <!-- 按钮区域 -->
                <el-form-item class="btns">
                    <el-button type="primary" @click="login">登陆</el-button>
                    <el-button type="info" @click="resetLoginForm">重置</el-button>
                </el-form-item>
            </el-form>

        </div>
    </div>
</template>

<script>
export default {
  data () {
    return {
      // 这是登陆表单的数据绑定对象
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      loginFormRules: {
        //  用户名校验
        username: [
          { required: true, message: '请输入用户名称', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入登陆密码', trigger: 'blur' },
          { min: 6, max: 15, message: '用户名或者密码错误', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 点击按钮重置表单
    resetLoginForm () {
      this.$refs.loginFormRef.resetFields()
    },
    login () {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return false
        const { data: res } = await this.$http.post('login', this.loginForm)

        if (res.meta.status !== 200) return this.$message.error('登陆失败, 用户名或者密码错误')
        this.$message.success('登陆成功')
        // 1、将登陆成功之后的 token，保存到客户端的 sessionStorage 中
        //  1.1 项目中除了登陆之外的API接口，必须在登陆之后才能访问
        //  1.2 token 只应在当前网站打开期间生效，所以将 token 保存在 sessionStorage 中
        window.sessionStorage.setItem('token', res.data.token)
        // 2、通过编程式导航跳转到后台主页，路由地址是 /home
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
    background-color: #2b4b6b;
    height: 100%;
}
.login_box {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 5px;

        .avatar_box {
            position: absolute;
            left: 50%;
            transform: translate(-50%, -50%);
            height: 130px;
            width: 130px;
            margin: 0;
            padding: 10px;
            border:1px solid #eee;
            border-radius: 50%;
            box-shadow: 0 0 10px #ddd;
            background-color: #fff;
            img {
                height: 100%;
                width: 100%;
                border-radius: 50%;
                background-color: #eee;
            }
        }
}
.btns {
    display: flex;
    justify-content: flex-end;
}
.login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}

</style>
